(19)
(11) EP 2 552 179 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.11.2014 Bulletin 2014/47

(43) Date of publication A2:
30.01.2013 Bulletin 2013/05

(21) Application number: 12174538.4

(22) Date of filing: 02.07.2012
(51) International Patent Classification (IPC): 
H05B 33/08(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 26.07.2011 JP 2011162873

(71) Applicant: Panasonic Corporation
Osaka 571-8501 (JP)

(72) Inventors:
  • Yamamoto, Masafumi
    Chuo-ku, Osaka 540-6207 (JP)
  • Hamamoto, Katunobu
    Chuo-ku, Osaka 540-6207 (JP)
  • Asano, Hiroyuki
    Chuo-ku, Osaka 540-6207 (JP)
  • Takikita, Hisaya
    Chuo-ku, Osaka 540-6207 (JP)
  • Nakagawa, Hiroyuki
    Himeji, Hyogo 670-0971 (JP)
  • Yoshimoto, Yuji
    Himeji, Hyogo 670-0971 (JP)

(74) Representative: Appelt, Christian W. 
Boehmert & Boehmert Anwaltspartnerschaft mbB Patentanwälte Rechtsanwälte Pettenkoferstrasse 20-22
80336 München
80336 München (DE)

   


(54) Lighting device and illumination apparatus using same


(57) An LED lighting device includes: a power source unit for supplying the DC output voltage to a light-emitting diode; a control unit for adjusting the DC output voltage; and a control power source unit for supplying a control power to the control unit. The control power source unit generates the control power with the DC output voltage and has: a current-limiting resistor for limiting an electric current that flows from the power source unit to the control unit; a constant voltage unit for converting a voltage to be applied to the control unit through the current-limiting resistor unit to a constant voltage; and a switching unit for switching a resistance value of the current-limiting resistor unit among a plurality of resistance values.







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